Answer:
It has to be environmentalism
Plantation owners were losing the native Americans because of sicknesses so they need more people to help them without losing a lot of money.
D.), because that allowed factory workers to work night shifts as well. It's not A.), because that happened during the first Industrial Revolution came about and trains became widespread. B.) doesn't make sense, because you really can only harvest in the daylight, and there's nowhere to put a light bulb. C.) is more of an effect of D.)
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True
now common in union strikes, picket lines are simply guarded boundaries where dissenting members, enemies, and non-members are not allowed to pass. guards in a camp keep a watch in the picket line and are often stationed.
The case promoted equal integration for all children to help combat racial inequality in education, therefore the last choice is the correct answer!